Unit 1.3 / Network Attacks / Study Notes

Question	Answer
Open Systems Interconnection (OSI) reference model Image: edc1287b-ca46-4c8b-a273-7772c499fc69 (image/jpg)	Developed by the International Organization for Standardization (ISO) IN 1977 to aid understanding of how a network system functions in terms of both the hardware and software components.
TCP/IP Protocol Suite Image: bdd47121-15ee-4265-9b11-8934bad2920e (image/jpg)	A four-layer conceptual model also called ARPA or DoD model
Link Layer / Network Interface Image: 3a83d6de-318e-4b5e-9319-7b7f614123a4 (image/jpg)	Equivalent of the OSI physical and data link layers as it defines the host’s connection to the network.
Internet Layer (Internetwork Layer)	Provides addressing and routing functions. It uses a number of protocols (notably the Internet Protocol [IP] and Address Resolution Protocol [ARP]) to ensure the delivery of packets.
Transport Layer	Provides communication between the source and destination computers and breaks application layer information into segments. TCP/IP provides two methods of data delivery: 1. Connection-oriented using TCP 2. Connectionless using UDP.
Application Layer Image: f948e6ec-db15-4ba1-bae6-8d2f115bb08b (image/jpg)	Layer at which most TCP/IP services (high level protocols such as FTP, HTTP and SMTP) are implemented.
Network Boundaries

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